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A hard reset could fix the problem. Turn off the phone by removing the battery. Insert the battery and turn on the phone while pressing the up arrow of the scroll wheel. You will be prompted to reset the phone. This will erase all of your data (photos, videos etc). Select yes and hopefully the hard reset will default everything back to factory settings.

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Hello.. I'm assuming that you did not try to install a ROM or update the firmware in any way.. doing so and interrupting the process or if on a bad connection with WiFi, or downloading a corrupt install file can break your phone causing problems.

For whatever reason this happened try the following instructions:

pull your battery out

then re-insert after 30 seconds

boot into recovery mode (see attached video) [Press at same time: Power button, Volume up, and Home button.. when you see the blue words at top take finger off Power while still holding other buttons down until you get into Recovery Mode (you will see a bunch of lines of text.. if you see a little green robot says "installing system update" let it do it while taking fingers off all buttons.. it may say "error" = ignore this.. then you will see all the text]

wipe date, wipe cache, reboot [*be extra careful what you select: use your down volume key to scroll to wipe cache partition" use the power button to select this [you do not want to select "wipe data/factory reset" unless there is no other hope of getting back into your phone]

it takes less than a second to wipe the cache partition, then use the power key to select "reboot system now"

If the phone reboots fine you are done..

>> If the phone refuses to reboot, and hangs again at the Samsung Logo, then you know you have to go back into Recovery Mode and select "wipe data/factory reset" = after which you should be able to get back into your phone but it will wipe all of your data/everything clean from your phone. Your phone will be as if you just bought the phone with nothing of yours on it. You will have to setup your phone all over again.

hard reset the phone, try;If you cannot run program to
hard reset form "Expert" folder. Turn off your phone, then press both
*SOFT KEYS* and *POWER ON* device. After moment release both soft keys.
On the black screen asking for confirmation press *GREEN PHONE BUTTON*
and wait couple minutes for phone to initialize.

Reset the iPhone by holding the sleep/wake button at the top right of the device and the home button at the bottom center of the face at the same time. Hold them both until you see the screen go black and the white Apple logo appear. When this happens, you can let go - the iPhone is rebooting.

Resetting the iPhone should not remove or delete any data or settings.

if it still gives you problems then you have a hardware issue, apple won't touch a jailbroken iphone so hopfully you have the apple care protection. Restore it to factory settings and try to take it in for service.

I have an iphone that does this at times too! I have to reboot it periodicly, seems more often when I use it a lot. I have found several issues with winterboard and plugins for it to cause some of my problems. might try changing your screen to normal and see if it still acts this way.

I ran into the same exact issue. Here is a simple fix: With the phone off, hold UP on the center D-pad and then power on. It tells you to press 1 to reformat and reboot, or press any other key to skip. Note that this process will erase all files (contacts, 3rd party applications, calendar entries, pictures, videos, etc.) and settings on your Blackjack and make it as fresh as the day you bought it. The hard reset fixed the problem in about 30 seconds.If you talk to ATT person, they will simply ask you to get a new phone. I had debated getting a new phone but finally searching on the web helped find another person who had the exact same issue and mentioned it. So I thought I would share with others. Good luck.